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Municipalities can take various measures to prevent damage from extreme rainfall events like increasing the dimension of the combined sewer system, separate them into foul and storm sewer systems, increase the infiltration capacity of the subsoil by reducing the (poorly permeable) paved surface, increase the infiltration surface in (underground) facilities or increase the permeability of the paving, install green / blue roofs to ensure delayed drainage and evaporation of water to the atmosphere or by building stor...